before the feminazi's ruined it, my favorite pickup line (or just general go-to) was "You know what would look good on you? A smile."
Worked everytime. Even on a raging angry, (Like red in the face, storming, stomping, pissed off VERY angry) woman who I used to work with. The best part is they think you're going to say something pervy.
That's a pretty good one